EP0481139B1 - Procédé de déshydratation - Google Patents

Procédé de déshydratation Download PDF

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Publication number
EP0481139B1
EP0481139B1 EP90311414A EP90311414A EP0481139B1 EP 0481139 B1 EP0481139 B1 EP 0481139B1 EP 90311414 A EP90311414 A EP 90311414A EP 90311414 A EP90311414 A EP 90311414A EP 0481139 B1 EP0481139 B1 EP 0481139B1
Authority
EP
European Patent Office
Prior art keywords
sludge
plow
belt
plows
rows
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90311414A
Other languages
German (de)
English (en)
Other versions
EP0481139A1 (fr
Inventor
John Goron
Ronald G. Renza
Robert J. Crosby
Erich W. Sodtalbers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komline Sanderson Engineering Corp
Original Assignee
Komline Sanderson Engineering Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Komline Sanderson Engineering Corp filed Critical Komline Sanderson Engineering Corp
Priority to AT90311414T priority Critical patent/ATE131741T1/de
Priority to DE1990624355 priority patent/DE69024355T2/de
Publication of EP0481139A1 publication Critical patent/EP0481139A1/fr
Application granted granted Critical
Publication of EP0481139B1 publication Critical patent/EP0481139B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element

Definitions

  • the present invention relates generally to the field of separating the liquid phase from the solid phase of a sludge or slurry.
  • This separation is hereinafter referred to as "dewatering.”
  • the sludge or slurry hereinafter jointly referred to as “sludge,” is deposited on and travels with a flight of an endless filter media with the liquid phase draining by gravity through the media and the solid phase travelling with the media to the point of discharge from the gravity dewatering part of the filtration equipment.
  • US-A-4879033 discloses a process for dewatering sludge on a flight of a foraminous filter belt which moves longitudinally between sludge deposit and discharge positions, in which sludge is deposited on the belt flight and carried longitudinally toward a sludge discharge position past first and second rows of plows which elevate and mix the sludge as it passes them.
  • the apparatus disclosed in that patent comprises apparatus for dewatering sludge, comprising a foraminous filter belt having a flight which is movable between sludge deposit and discharge positions, and a plurality of plows arranged in respective first and second rows extending laterally across the flight and spaced apart longitudinally of the flight, the second row (or rows) being positioned downstream of the first row (or rows), each plow having the general form of a truncated cone with a vertical axis with the plane of its base and the belt and having a side wall extending upwardly and inwardly away from the belt.
  • the present invention seeks to improve or to simplify the separation of liquid from a sludge as compared with the processes and apparatus disclosed in the above mentioned patents.
  • the process of the present invention is characterised in that the plows in the second row or rows are shaped to elevate and mix the sludge to a greater extent than the plows in the first row or rows and the apparatus is characterised in that the base angles of the cones in the second row or rows are greater than the base angles of the cones in the first row or rows.
  • each row or rows elevating and mixing the sludge to a greater extent than the preceding, upstream row or rows.
  • a feed hopper 11 accumulates sludge 12 having a high liquid content. As sludges are measured in solids content, that content may typically be from one quarter to one percent (or more) solids.
  • Flight 10 of the filter media is shown extending between rollers 15 and 16, which guide rollers rotate in a counter-clockwise direction so that the flight moves in the direction indicated by arrow 17. As guided by rollers 15 and 16, the flight 10 accumulates slurry or sludge 12 from feed hopper 11, which is deposited on the flight.
  • the slurry then passes on the foraminous belt and, in the particular embodiment illustrated, contacts an upstream row of conical plows 20. Thereafter, the belt transports sludge to a second, downstream row of plows 21, and then further downstream to plow rows 22, 23, 24 and 25. After passing by the row of plows 25, the sludge is then discharged into a suitable receptacle as the belt flight 10 passes about discharge roller 16 in a conventional manner.
  • FIG. 3 The structure of an individual plow and the means by which the plow is mounted for operation are seen in a preferred mode in FIG. 3.
  • Two plows are shown in FIG. 3, the plow assembly 30 to the left being shown in side elevation and the plow assembly 31 to the right being seen in vertical section.
  • the elements of the plow and its mounting means comprise a horizontal post 33, which can be circular or square in cross-section, extends across the width of the belt, and is suitably mounted in side walls or other conventional structure located on either side of the belt flight 10.
  • post 33 extends across the belt and the sludge carried on the belt, and carries support structure for maintaining the conical plows in position to dewater the slurry or sludge carried on the belt.
  • a collar 34 is firmly fixed to the post 33.
  • Collar 34 forms an interior, extended orifice 35.
  • Extending within orifice 35 is a shaft 36 which terminates at one end in plow 38 and at the other end in a shaft head 39 that extends above the collar 34.
  • shaft 36 There is a short length of shaft 36 between the top of the collar 34 and the bolt 39 to permit vertical movement of plow assembly 30.
  • shaft 36 terminates downwardly in a nut 40 located above the conical plow 38 and a lock nut 41 that is located below the shell of the conical plow 38. In this manner, as mounted between nuts 40 and 41 at the lower end of shaft 36, the conical shell of plow 38 is firmly fixed on the shaft 36 so that the plow can only move in conjunction with shaft 36.
  • shaft 36 has a diameter slightly less than the diameter of orifice 35 of collar 34, shaft 36 is free to rotate within collar 34. Further, shaft 36 is free to move in a generally vertical direction within the orifice 35. Motion in a downward direction by shaft 36 is limited by shaft head 39 affixed to the upper end of the shaft so that, for example, if the filter media 10 is removed for cleaning or repair, the plows 38 will move downward for a relatively short distance and will still be positioned so that on replacement of the filter media the plows will be in their proper position for dewatering sludge or slurry on the media.
  • the plow assembly illustrated in FIG. 3, also includes an elongated sleeve that encloses the shaft 36.
  • sleeve 37 In operative position sleeve 37 has its axis vertically disposed and is freely rotatable independently of any movement of the shaft 36.
  • Use of such a sleeve acts to avoid hang-up of fibrous or other materials on shaft 36, since when there is any such tendency for material to adhere to shaft 36, the presence of a light rotatable sleeve will permit rotation and movement of the material past the sleeve and, therefore, the shaft.
  • the side walls or shells of the plows have a slope that form an angle with plane of the base of the plow.
  • base is used whether the plow has a closed base or, as shown in the preferred embodiment, where the base of the plow is left open so that access may be had to the lock nut 41 in case it is desired to remove the plow.
  • FIG. 4 Shown herein in FIG. 4 in top plan and side elevations are several variants of cones that may be used in accordance with the present invention to elevate and mix sludge carried on a filter belt.
  • FIG. 4A are cones having side walls that vary between slightly greater than 0° and approaching but less than 90° angles with the horizontal.
  • FIG. 4B are plows where the frustum of a plow is then joined to a circular right cylinder, the cylinder being designated by numeral 43, mounted atop the frustum of circular right cone 42.
  • FIG. 4C Shown in FIG. 4C are two general cones 45 with offset axes 46.
  • FIG. 4D are shown a series of convoluted conical sections 49. Such sections are spaced closely together as shown in top plan view in FIG. 4D, and are not rotatable.
  • a preferred embodiment of my invention is to employ in rows 20 and 21 plows that have a lower profile, i . e ., plows the side walls of which form a lesser angle with the planes of their bases.
  • the lower profile plows have a vertical dimension of 3 ⁇ 4 inch (18.5 mm) between the base of the plow and the upward termination of the plow just below nut 40, which plow portion might be termed its frustum. In a higher profile plow, that vertical dimension has 11 ⁇ 2 inches (37 mm).
  • the low profile plows rows of which are located upstream in the direction of flow of sludge on the belt, have angles of approximately 15° with the horizontal; the higher profile plows located downstream in the path of movement of the belt have side walls that make angles of approximately 30° with the bases of the plows. Because of the way the plows are mounted, all of the plows are free to float on the belt and, in preferred form, ride directly on the belt, perhaps separated by a thin layer of sludge that may adhere to the upper surface of the belt.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Sludge (AREA)
  • Filtration Of Liquid (AREA)

Claims (12)

  1. Procédé de déshydratation de boues sur un brin (10) d'une courroie perforée de filtration qui se déplace longitudinalement entre les positions de dépôt et d'évacuation de boues, dans lequel les boues (12) sont déposées sur le brin (10) de la courroie et transportées longitudinalement vers une position d'évacuation de boues le long d'une première et d'une seconde rangée (20, 21, 22) de socs qui soulèvent et mélangent les boues lors de leur passage, caractérisé en ce que les socs de la seconde rangée ou des secondes rangées (22) ont une configuration telle qu'ils soulèvent et mélangent les boues de façon plus importante que les socs de la première rangée ou des premières rangées (20, 21).
  2. Procédé selon la revendication 1, dans lequel les boues circulent le long d'une troisième rangée ou de troisièmes rangées (23) de socs qui mélangent les boues une troisième fois de façon plus importante que le soulèvement et le mélange réalisés par la seconde rangée ou les secondes rangées.
  3. Procédé selon la revendication 1 ou 2, dans lequel les secondes rangées de socs et les rangées éventuelles ultérieures soulèvent et mélangent les boues et provoquent leur chute sur elles-mêmes afin que les parties internes des boues soient exposées.
  4. Appareil de déshydratation de boues, comprenant une courroie perforée de filtration ayant un brin (10) qui est mobile entre des positions de dépôt et d'évacuation de boues, et plusieurs socs placés dans des premières et secondes rangées respectives (20, 21, 22, etc.) disposées latéralement en direction transversale au brin et espacées suivant la longueur du brin, la seconde rangée ou les secondes rangées (22) étant placées en aval de la première rangée ou des premières rangées, chaque soc ayant la forme générale d'un tronc de cône (38) d'axe vertical dont le plan de la base est au niveau de la courroie et ayant une paroi latérale qui remonte depuis la courroie et est dirigée vers l'intérieur en s'écartant de la courroie, caractérisé en ce que les angles de base des cônes de la seconde rangée ou des secondes rangées (22) sont supérieurs aux angles des bases des cônes de la première rangée ou des premières rangées (20, 21).
  5. Appareil selon la revendication 4, dans lequel chaque cône (38) est un cône de section droite circulaire.
  6. Appareil selon la revendication 5, dans lequel la paroi latérale de chaque cône d'une rangée intercepte le plan de la base du cône avec un angle d'environ 15°.
  7. Appareil selon la revendication 5, dans lequel la paroi latérale de chaque cône des secondes rangées et rangées suivantes (22, 23, etc.) intercepte le plan de la base du cône avec un angle d'environ 30°.
  8. Appareil selon la revendication 4, 5 ou 6, dans lequel les socs d'une rangée (21, 22, etc.) sont alignés longitudinalement sur des espaces compris entre les socs de la rangée précédente en amont (20, 21, etc.).
  9. Appareil selon l'une quelconque des revendications 4 à 8, comprenant un dispositif de montage de chaque soc par rapport à la courroie, comprenant un montant (33) placé horizontalement transversalement au trajet de la courroie et un arbre (36) interconnecté au montant et dépassant du montant vers le bas, le corps de soc étant fixé à l'arbre à son extrémité dirigée vers le bas de manière que, dans la position de fonctionnement, une surface externe de la paroi latérale de corps du soc forme une pente continue dirigée vers l'intérieur depuis la base au niveau de la courroie vers l'arbre, si bien que, lors du déplacement de la courroie vers le soc et le long de celui-ci, les boues portées par le brin de la courroie remontent sur la paroi latérale du corps conique de soc et assurent ainsi le soulèvement et la perturbation du courant de boues et le mélange et l'agitation de ce courant si bien que la circulation du liquide des boues vers la courroie perméable aux liquides et à travers cette courroie augmente.
  10. Appareil selon l'une quelconque des revendications 4 à 9, comprenant un collier (34) monté sur chaque montant (33), le collier (34) formant à l'intérieur un orifice allongé (35) dont l'axe est pratiquement vertical lorsque le soc (38) est dans une position de soulèvement et de mélange de boues, un arbre (36) placé dans l'orifice (35) et ayant un diamètre légèrement inférieur au diamètre interne du collier (34) afin que l'arbre puisse tourner dans l'orifice et se déplace aussi axialement dans celui-ci, le soc (38) étant fixé à une première extrémité de l'arbre de manière que, lorsque le soc est en position de soulèvement et de mélange de boues, il dépasse pratiquement verticalement vers le bas sous le collier vers la courroie (10) et soit maintenu, par le poids du soc et de l'arbre, au contact de la courroie.
  11. Ensemble à soc selon la revendication 10, dans lequel le soc (38) est maintenu en position fixe par rapport à l'arbre (36) à son extrémité inférieure.
  12. Ensemble à soc selon la revendication 10 ou 11, dans lequel la tête (39) de l'arbre est placée à la partie supérieure de l'arbre au-dessus de l'orifice du collier afin que le déplacement de l'arbre et du soc soit limité dans la direction de la courroie.
EP90311414A 1989-07-20 1990-10-17 Procédé de déshydratation Expired - Lifetime EP0481139B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT90311414T ATE131741T1 (de) 1990-10-17 1990-10-17 Entwässerungsverfahren
DE1990624355 DE69024355T2 (de) 1990-10-17 1990-10-17 Entwässerungsverfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/382,279 US4986911A (en) 1989-07-20 1989-07-20 Dewatering process and apparatus

Publications (2)

Publication Number Publication Date
EP0481139A1 EP0481139A1 (fr) 1992-04-22
EP0481139B1 true EP0481139B1 (fr) 1995-12-20

Family

ID=23508269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90311414A Expired - Lifetime EP0481139B1 (fr) 1989-07-20 1990-10-17 Procédé de déshydratation

Country Status (2)

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US (1) US4986911A (fr)
EP (1) EP0481139B1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5238584A (en) * 1992-01-28 1993-08-24 J. R. Schneider Co., Inc. Apparatus for removing filtrate from filter media
US5560834A (en) * 1995-04-06 1996-10-01 Gold; Dennis D. Machine for dewatering a slurry of ultrafine solids
US6053333A (en) * 1995-10-06 2000-04-25 Roediger Pittsburgh, Inc. Method and system for transferring sludge, including a plow for dispersing sludge
AU4145897A (en) * 1997-02-14 1998-09-08 Warner-Jenkinson Company, Inc. Method and apparatus for purifying water-insoluble compounds
US6871745B2 (en) * 2002-12-20 2005-03-29 John D. Lynn Distributor apparatus for providing a uniform discharge of material
WO2010104867A1 (fr) 2009-03-09 2010-09-16 Univenture Procédé et appareil pour séparer des particules d'un liquide
JP5777320B2 (ja) * 2010-10-28 2015-09-09 株式会社クボタ ベルト式ろ過装置
NO340356B1 (en) * 2015-09-04 2017-04-10 Cubility As Apparatus and method for separating liquid from a material comprising a solid fraction and a liquid fraction
WO2018049411A1 (fr) * 2016-09-12 2018-03-15 Vermeer Manufacturing Company Systèmes et procédés pour traiter des boues de terre
US11084747B2 (en) * 2019-09-24 2021-08-10 Alfa Laval Corporate Ab Dewatering apparatus, systems, and methods

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US465497A (en) * 1891-12-22 randall
US2097529A (en) * 1934-12-20 1937-11-02 Advance Engineering Company Filter
NL176054C (nl) * 1974-02-27 1985-02-18 Bellmer Geb Kg Maschf Filterinrichting.
GB2068760B (en) * 1980-01-23 1984-02-01 Hartley Simon Ltd Apparatus for thickening sludge
US4602998A (en) * 1985-06-27 1986-07-29 Komline-Sanderson Engineering Corporation Raisable plow assembly
US4609467A (en) * 1985-08-07 1986-09-02 Komline-Sanderson Engineering Corporation Rotary plow assembly
US4729836A (en) * 1986-12-01 1988-03-08 Arus Andritz-Ruthner, Inc. Flexible chicane system for liquid-solid separation equipment
US4857193A (en) * 1987-06-01 1989-08-15 Arus-Andritz Ruthner, Inc. Floating chicane system for liquid-solid separation equipment
US4879033A (en) * 1988-08-26 1989-11-07 Pilgrim's Pride Corporation Slurry plow
FR2647028B1 (fr) * 1989-05-18 1992-07-24 Saulnier Michel Dispositif d'egouttage d'une suspension solide-liquide

Also Published As

Publication number Publication date
EP0481139A1 (fr) 1992-04-22
US4986911A (en) 1991-01-22

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